Papers by Tom Hoogesteger
A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaari... more A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaari-na, southwestern Finland. The species had not previously been recorded from Finland. The frogs show the external characteristics of the northern clade of the species, which suggests that they are of different origin than the allochthonous edible frogs (Pelophylax kl. esculentus) that are also present in southwestern Finland.
A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaari... more A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaarina, southwestern Finland. The species had not previously been recorded from Finland. The frogs show the external characteristics of the northern clade of the species, which suggests that they are of different origin than the allochthonous edible frogs (Pelophylax kl. esculentus) that are also present in southwestern Finland.
Distinguishing between native and introduced species can be difficult, particularly at range bord... more Distinguishing between native and introduced species can be difficult, particularly at range borders, where patchily distributed populations may occur away from a species' natural core range. The case of native pool frog (Pelophylax lessonae) populations at their northern range limit in Europe is particularly interesting. These are morphologically and genetically distinct populations which are patchily distributed and have been reported from the UK, Sweden and Norway, but up until 2013 were thought to be absent from Finland. When pool frog populations were discovered in southwestern Finland they were morphologically classified as belonging to this northern clade. However, the origin of these populations has been unclear and it is possible that the Finnish populations originated through human aided introductions, established themselves recently through natural migration, or are indeed previously undiscovered relic populations. To establish the origin and relationship of these fro...
Memoranda Societatis Pro Fauna Et Flora Fennica, Dec 31, 2013
A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaari... more A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaarina, southwestern Finland. The species had not previously been recorded from Finland. The frogs show the external characteristics of the northern clade of the species, which suggests that they are of different origin than the allochthonous edible frogs (Pelophylax kl. esculentus) that are also present in southwestern Finland.
Memoranda Societatis Pro Fauna Et Flora Fennica, Dec 31, 2013
A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaari... more A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaarina, southwestern Finland. The species had not previously been recorded from Finland. The frogs show the external characteristics of the northern clade of the species, which suggests that they are of different origin than the allochthonous edible frogs (Pelophylax kl. esculentus) that are also present in southwestern Finland.
Behavioral Ecology, 2010
Müllerian mimicry, where 2 or more unrelated aposematic species resemble one another, is predicte... more Müllerian mimicry, where 2 or more unrelated aposematic species resemble one another, is predicted to reduce the per capita mortality of co-mimics by allowing them to share the cost of educating naïve predators about their unpalatability. However, the specific assumptions and predictions of Mü ller's theory of shared resemblance have been previously unsupported; some authors have suggested that the benefits of signal similarity are undetectable or at best very small. We demonstrate clearly and unambiguously that mimicry between 2 defended forms can provide substantial protection from uneducated predators in the manner proposed originally by Müller. By utilizing prey signals that were designed and demonstrated, to be equally visible, learned with equal facility, and discriminated by our predators, we assessed the effect of the presence of signal mimicry on the survival of a Model species in a ''novel world'' experiment, with wild-caught great tits (Parus major) as predators. We found that the net effect of mimicry was mutualistic, with co-mimics showing increased survivorship through shared predator learning. Visually distinct prey showed a mortality benefit from coexistence even without signal mimicry as a result of a density-dependent dilution effect. Perfect mimicry provided an added benefit of enhanced predator avoidance learning, and our results suggest that the benefits of shared warning signals may be even stronger than Mü ller originally proposed.
A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaari... more A population of pool frogs (Pelophylax lessonae) has been discovered in the municipality of Kaarina, southwestern Finland. The species had not previously been recorded from Finland. The frogs show the external characteristics of the northern clade of the species, which suggests that they are of different origin than the allochthonous edible frogs (Pelophylax kl. esculentus) that are also present in southwestern Finland.
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Papers by Tom Hoogesteger